DE8618732U1 - Aspherical condenser - Google Patents

Description

The invention relates to an aspherical condenser for use in the illumination beam path of projectors and similar devices.

It is an object of the invention to provide such a condenser which operates at maximum brightness, i. with maximum light transmission, a high degree of uniformity of illumination and freedom of color in consideration management level.

This object is achieved by a condenser _t incorporating the features specified in the claim.

The aspherical surface of the condenser is itself generated by the rotation of a higher order parabola, which is caused by the equation

² / h ² \ ³ '/ h ² \ ⁴

♦ fe;) ⁺ fe $ ♦

^p - fe- ♦

is described. In this equation: h s the storage of a curve point from the x-axis, ρ «the offset of the same curve point from the y-axis

(s arrow height)

r = the radius of the curve at the apex between the curve points + h- and - h-.

However, it has been found that a condenser, the aspherical surface of the rotation curve of such mathematically accurate parabola is formed, does not solve the problem on which the invention is based. To one

β a * β η λ «ce β; . r «

«He

aspherical condenser with maximum brightness and maximum illumination evenly and color freedom it is necessary to add certain c-constants to the individual terms of the above equation, the choice of which constitutes the essential basis of the invention.

According to the invention, the c constants are chosen in such a way that that the arrow heights ρ given in the characterizing part of claim 1 result. It was found that of these Arrow heights a deviation of + 15% can be tolerated can. In this context, too, you get an aspherical condenser that delivers the desired quality to saints peculiarity, uniformity of illumination and freedom from color.

In the drawing, the invention is shown in several AusfUhrUngsbeispielen. Show it:

Fig. 1 shows a parabola, as it is the invented condenser

underlying,

Fig. 2-5 Execution examples of condensers with differently shaped largest diameter sides of the condenser.

In Fig.l different arrow heights ρ are a function

from the storage h of the curve points indicated by the x-axis.

Different concrete spatial shapes of the invented condenser are shown in FIGS. 2-5. The figures show. that the condenser is bounded by a surface of the largest diameter running perpendicular to the condenser axis. The connection between the aspherical surface and this surface running essentially perpendicular to the condenser axis can now be shaped in various ways.

For example, Fig. 2 shows a condenser which is connected to a simple Bund 1 is provided.

FIG. 3 shows a condenser which also has a collar 1 , but a conical surface 2 is inserted between the collar and the actual aspherical surface, which is at an angle of approximately 30 ° to the optical axis.

Fig. 4 shows a bracket with a stepped collar 3, whereby the upper step is also limited by a conical surface.

Finally, FIG. 5 shows a condenser in which the

aspherical surface merges directly into a cylinder surface 4.

Other geometric boundary surfaces can be used as required (= Holder of the condenser iii the socket) can be selected. The optical data of the aspherical surface are not affected.

'4 · · · 1 5 1 J 7 I l

g · · 10'J) SiJt *

! #i) a »)» lilt

! · · I α ) ¹ J II ι

; ···· »· V ι)> JIiJ

The diameter D of the condenser and its center thickness Md

can be varied within wide limits, again without affecting the optical data of the aspherical surface of the condenser. In general, this can be said that the l 5 DUi'ChiTieSSer üfiiöü Wiru be greater, the greater the Mittenäicke is and vice versa.

It has been found that condensers with a center thickness approximately between 20-27 mm and a diameter of approximately between 43-54 mm are particularly useful in practice,

ta * · ««

Claims (14)

Expectations 1. ) Aspherical condenser for use in the illumination beam path of projectors and similar devices, whose aspherical surface is generated from the rotation of a parabola of a higher order according to the equation • · · fc · f fe "fo ⁴ £ ' is calculated, in which h * the lateral offset of a curve point from the χ-axis, ρ »the associated offset of the same curve point from the y-axis (arrow height), r _Q * the apex radius at the apex of the condenser, and C -... C _n each mean a constant which causes the deviations in the position of this curve point from the mathematically precise curve shape, characterized in this . that the c constants are chosen in such a way that the following arrow appears in the curve points h listed below heights ρ with a deviation of ί 15% result in: 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12 * 000 13,000 0.029 0.116 0.262 0.468 0.734 1.062 1.453 1.911 2.436 3.034 3.700 4.458 5.295 14,000 6th , 224 15,000 7th , 251 16,000 8th , 387 17,000 9 , 641 18,000 11th , 027 19,000 12th , 559 20,000 14th , 257 21,000 16 , 140 22,000 18th , 235 23,000 20th , 571 24,000 23 , 180 • · · I> I Il U ■ · 1 111 • · »111) 1 • · I Il 1 > 1> ■ I ItIl • · · 11 11 2.) Aspherical condenser according to claim 1, characterized in that the aspherical surface on the side of the condenser having the largest diameter in a linear surface of revolution passes over. 3.) Aspherical condenser according to claim 2, characterized in that the linear surface of revolution is a conical surface. 4.) Aspherical condenser according to claim 2, characterized in that the linear surface of revolution is a cylindrical surface. 5.) Aspherical condenser according to claims 2-4, characterized . that the condenser has a combination of conical surface and cylinder surface or a combination of cylinder surfaces of different diameters on the condenser side having the largest diameter (step). 6.) Aspherical condenser according to claim 1, characterized . that the diameter (D) of the condenser is about 48-54 mm and the center thickness (Md) of the condenser is between 20-27 mm.